Abstract

A sudden reduction in the number of reported genital chlamydia cases was observed in Norrbotten County, Sweden, during October to November 2009. After exploring other possibilities, such as a reduction in the number of chlamydia tests analysed or a new Chlamydia trachomatis variant that had been undetected in standard laboratory tests, it was found likely that the decrease was an indirect effect of the 2009 influenza A(H1N1) pandemic due to reduced social interactions among young adults.

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On 21 February 2019, the World Health Organization (WHO) published recommendations on the composition of the vaccines for the 2019/20 northern hemisphere influenza season. Considering recent changes in the proportions of genetically and antigenically diverse A(H3N2) viruses, WHO will announce the recommendation for the A(H3N2) component later, on 21 March 2019. Read more.